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Shydlovska T.A., Shydlovska T. V., Petruk L.G.


SI "Institute of Otolaryngology named after Prof. O. S. Kolomiychenko NAMS of Ukraine", Kiev

Full article (PDF), UKR

Introduction. The action of noise on the auditory analyzer , as one of leading etiological factors of sensorineural hearing loss (SHL), is of concern for many researchers. However, in addition to negative effect directly on the hearing, noise, also, affects the state of the cerebral hemodynamics.

Purpose: studying qualitative indices rheoencephalography in patients of "noisy" professions and in those with acoustic trauma and their comparative analysis.

Materials and methods. Studies of qualitative indices of REG-examination in 84 patients with acoustic trauma, 15 patients of "noisy" professions 15 healthy individuals as the control group have been conducted. The studies related to carotid and vertebral-basilar systems of the blood circulation. A comparative analysis has been made. The cerebral blood flow in patients with acoustic trauma was studied on the computer reograph "DX – systems" (Kharkiv), using a method of rheoencephalography. Results. The analysis of qualitative indices of REG curves revealed disorders in the cerebral blood circulation in all studied patients of both groups, expressed in varying degrees. In 100 % patients in both groups there were observed increased cerebral vessel tonus and difficulty of venous outflow both in carotid and vertebra-basilar basins; in a significant percentage of cases angiospasm was occurred. Moreover, severe abnormalities in brain vessels were found exactly in the vertebrobasilar system in both groups of patients. Angiospasm was more frequently observed in patients with acoustic trauma than in those with "noisy" professions (48,8 % against 40,0 %) in the carotid system and 57,1 % against 40,0 % in the vertebrobasilar system. Cases of unstable vascular tonus were not observed among workers of "noisy" professions, whereas 17,9 % cases were recorded in patients with acoustic trauma in both systems of the cerebral circulation. As for the pulse bloodfilling in the vertebrobasilar basin, its decrease was recorded in 48,8 % patients with acoustic trauma and in workers of noisy production it was only 6,7 %. In the carotid system the pulse bloodfilling was enough in both studied groups of patients.

Conclusions. The data obtained indicate the presence of expressed changes in the cerebral hemodynamics in patients of noisy professions and in those with acoustic trauma and show the appropriateness to use the rheoencephalography method for examination of such patients, aiming to further accounting the results in the process of treatment. The decrease in pulse blood filling, development of angiospasm of cerebral vessels and unstable vascular tonus are significant factors in development of sensorineural disorders after noise exposure.

Key words: sensorineural hearing loss, acoustic trauma, acoustic analyzer, cerebral blood flow, rheoencephalography


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